在一条直线上顺次取A、B、C三点，已知AB=5cm，点O是线段AC的中点，且OB

Billiards（台球） is my favorite ball sport. The English player Ronnie O’Sullivan and Chinese player Ding Junhui are   46  my favorite players. They play it very well. I hope I’ll be   47  to play it well, too. Of course, it is only a dream. Of the two players, I  48  O’Sullivan, because he played it so quickly in the races.

When I was nine, I   49_  this ball sport for the first time. My PE teacher, Mr. Xu, and I became good   50  because of billiards. I still remember that one day Mr. Xu and I played billiards   51  class. We were so excited that we both  52  the lunchtime. Suddenly, my father showed up, he was very angry with me.

Well, it is   53 to know the rules, but it is not easy to get a good  54  in the game. Now billiards is becoming more and more  55  in China, and more and more Chinese are enjoying it.

小题1:A.two            B.both             C.all

小题2:A.able           B.free             C.glad

小题3:A.love           B.like             C.prefer

小题4:A.hit            B.joined           C.played

小题5:A.athletes       B.friends          C.teachers

小题6:A.after          B.before           C.in

小题7:A.knew           B.forgot           C.remembered

小题8:A.easy           B.hard             C.difficult

小题9:.A.rule          B.score            C.player

小题10:A.boring        B.famous           C.popular

用于纠正酸中毒，增加心肌应激性的药物是（）

A.肾上腺素

B.利多卡因

C.阿托品

D.碳酸氢钠

E.洛贝林

如图所示的装置，可以探究影响安培力大小的因素，实验中如果想增大导体棒摆动的幅度，下列操作中可行的是（　　）

A．更换磁性较弱的磁铁

B．把磁铁的N极和S极对调

C．减小通过导体棒中的电流强度I

D．把接入电路的导线从②、③两端换成①、④两端

电网调度自动化系统某个厂站远动信号接收异常，如何处理？

在评估企业的内部控制时，不相容职责分离属于（）要素关注的内容。

A.内部环境

B.风险评估

C.控制活动

D.内部监督